1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.kernel.util;
24  
25  import java.io.Serializable;
26  
27  import java.util.Comparator;
28  
29  /**
30   * <a href="OrderByComparator.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   */
34  public abstract class OrderByComparator implements Comparator, Serializable {
35  
36      public abstract int compare(Object obj1, Object obj2);
37  
38      public String getOrderBy() {
39          return null;
40      }
41  
42      public String[] getOrderByFields() {
43          String orderBy = getOrderBy();
44  
45          if (orderBy == null) {
46              return null;
47          }
48  
49          String[] parts = StringUtil.split(orderBy);
50  
51          String[] fields = new String[parts.length];
52  
53          for (int i = 0; i < parts.length; i++) {
54              String part = parts[i];
55  
56              int x = part.indexOf(StringPool.PERIOD);
57              int y = part.indexOf(StringPool.SPACE, x);
58  
59              if (y == -1) {
60                  y = part.length();
61              }
62  
63              fields[i] = part.substring(x + 1, y);
64          }
65  
66          return fields;
67      }
68  
69      public boolean isAscending() {
70          String orderBy = getOrderBy();
71  
72          if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) {
73              return false;
74          }
75          else {
76              return true;
77          }
78      }
79  
80      public String toString() {
81          return getOrderBy();
82      }
83  
84  }